resolver

weight loss, %
114 Chapter 4
recorded PXRD patterns are in a good agreement with the patterns simulated from the singlecrystal
XRD data of the reported [Cu 3 (BTC) 2 ] n , suggesting all prepared Cu-MOFs being
isostructural analogs of the parent Cu-BTC. These observations indicate that Cu-DEMOFs with ip
DL incorporation can be prepared employing various Cu-precursors. However, only in the case of
using DMF as a reaction medium, phase-pure solids have been obtained. Similarly, synthesis of the
D7 and D8 in EtOH instead of DMF yielded precipitates with additional unknown phases (Figure
7.23).
Like in the case of Cu-DEMOFs D1-4, IR spectra of the samples (D5-8) obtained from the
reaction of Cu(NO3)2·3H2O and mixed linkers do not differ from the parent Cu-BTC (Figure
4.46). The presence of the residues from the starting metal precursors can be ruled out,
as no bands of [NO3] - (845-815 cm -1 ) is observed in the spectra of the prepared DEMOF
solids, which supports the conclusions made above on their phase purity. TGA curves of
all samples D5-8 show a slight decrease of thermal stability (Figure 4.47), in analogy to
the other four Cu-DEMOFs D1-4 obtained using Cu(BF4)2 6H2O as metal precursor,
suggesting no significant influence of the metal source on the thermal stability of the
resulting DEMOFs.
100
80
D8
Cu-BTC
60
D6
40
D5
D7
20
100 200 300 400 500 600
T, C
Figure 4.46. TG curves of the Cu-DEMOFs D5-8 in comparison with the parent Cu-BTC. Metal
source: Cu(NO 3 ) 2·3H 2 O. Solvent used for preparation of the D5 and D6 (olive): DMF plus HBF 4 ; for
D7 and D8 (magenta): only DMF.